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The literatur gives a view about synonomous expressions to dissections, the occur-rence, localisation, etiology and pathogenesis as well as about pathologic-anatomic-studies and radiograph descriptions of different structures.The own studyis based upon 41 fetlock- and 54 hockjoints. A histologic control is made from all shadows seen in the Fein-Fokus-Radiograph picture. All dissections are analysed to their proportionalety of soft, spongious and sclerotic parts-shadows. The description of these different structures is not a problem for Fein-Fokus-System, if the dissections are enlarged six times. The composition and the difference in size of the dissections are shown, some smaler groups are inspected.A connection of the horse race, the sex of the horse, the joint and the localisation in the joint is not found. Dissections in fetlock joints were found at trotters, warm-blooded horses, thoroughbred horses and other races whereas in tarsocural joints they are found only in totters and warmblooded horses.14 % of the fetlock dissections and 25 % of the tarsocrural joint dissections show sklerotic areas in the Fein-Fokus-Radiograph examination. There is a tendency, that sklerotic dissections of older horses have a higher grade of sklerotic but there is no connection with race and sex of horses with either joint and localisation in the joint. The trend of a higher sklerotic grade in older horses is described with exceptions for fetlockjoint as well as for tarsocrural joints, but there are not enough sklerotic.There was no relation to race, sex, joint or localisation in the joint.The dissections with spongious character don4t show connections in all above given parameters. Neither in size nor in composition of the dissections there was a trend for references.Dissections that were free in the joint, Free bodys, only were found in 6 of 95 joints, all 6 dissections are from fetlock joints. Even h
ere there were nor references to above mentioned parameters. Refeing to the total size it is remarkable that these free bodys are smaler than the total size of all dissections from fetlock joints.The snovial samples showed, in the number of cells (white blood cells) as in totalpro-tein a non-inflammable character.